Point editing

In my class project I am trying to edit a curve for a pipe. I don’t seem to be able to add a point to the line in edit mode as in Illustrator. Is there any way? Tapping ALT just duplicates the line itself instead of adding a point.
BTW it seems the help system is lacking. I entered “point” in the search and it lists the entire index, leaving me to do all the searching.

Hello - see Help on InsertKnot and InsertControlPoint.